iMessage question

Basically, I’ve given my old iPhone to a friend to use for a couple of days and I want to know if she’ll be able to see my old iMessages. I turned the phone on and the only messages that were there were those before I switched to my new phone (don’t care if she sees those) but it did prompt me to enter my iCloud password to use iMessage. I didn’t think anything of it and didn’t put my password in, assuming the messages that were there would be the only ones she would see. My question is, if she puts my password in (which she knows), will the messages between then and now load in? It was my understanding that if she enters the password then the iMessage will just be active from that point onwards but I just wanted to check. (I know I can change my password but it’s an effort to do it on all devices- I just want this question answered). Thanks